biochemistry
Chapter 1- amino acids
1. Which of the following is an essential amino acid?
a. Alanine
b. Glycine
c. valine
d. Aspartate
e. serine
2. The products of the catabolism of cysteine are:
a. Serine and phosphate
b. Serine and HCL
c. pyruvate and sulfate
d. serine and sulfate
e. Alanine and sulfate
3. Which of the following statements about glutamate is NOT true:
a. It can be synthesized in the transaminase reaction using alanine as a substrate
b. It can be synthesized in an aminotransferase reaction using aspartate as a substrate
c. It can be synthesized by the glutamate dehydrogenase reaction using alpha-ketoglutarate and free ammonium ion as substrates
d. It can transfer it’s amino group to oxaloacetate in a one step reaction
e. It can transfer it’s amino group to citrulline in a one step reaction
4. which statement is not correct?
a. Amino acids are building blocks of proteins.
b. proteins in mammalian bodies (including human body) made up of with 21 different amino acids.
c. All amino acids have a central carbon atom attached to a carboxyl group.
d. The amino acids differ from one another only in the chemical nature of the side chain (R).
e. 20 L-α-amino acids found in mammalian proteins. They are optical active (chiral).
5. What type of bond is formed between amino acids?
a. Hydrogen bonds
b. van der Waals interactions
c. covalent bonds (peptide bonds)
d. Ionic bonds
6. what are the precursors of catecholamines ?
a. tryptophan and tyrosine
b. phenylalanine and tyrosine
c. phenylalanine and tryptophan
d. valine and tyrosine
7. which abbreviation and symbol for amino acids is not correct?
a. alanine (Ala) (A)
b. Arginine (Arg) (R)
c. Asparagine (Asn) (A)
d. Cysteine (Cys) (C)
8. which amino acid below has aromatic side chain?
a. proline
b. tyrosine
c. valine
d. Glycine
e. Alanine
9. which amino acid below has negatively charged R group?
a. Aspartate
b. Lysine
c. arginine
d. Histidine
10. All of the following amino acids are glucogenic EXCEPT:
a. Leucine
b. Alanine
c. Glutamate
d. Phenylalanine
e. Cystine